Hi Michel, > But the air propelled downwards by the ion has a mass (hidden in the ion > mobility parameter), that's what's matters, just like the mass of a > helicopter's propeller is irrelevant. If one can speak of thrust for a > helicopter, one can speak of thrust for a lifter.
Several people have constructed lifters (and the related "thruster") to block airflow, which clearly demonstrates that airflow has nothing to do with the lift. Dave
